Use four spaces in frontmatter blocks

source/_talks/building-build-configs.md

@@ -2,27 +2,27 @@
 title: Building "Build Configs"
 description: In this lightning talk, I discuss the "Build Configs" tool I've built to create configuration files.
 speakerdeck:
-  id: e1403f0dfd8245e5a71df9761dc6bc7b
-  ratio: "1.78343949044586"
-  url: https://speakerdeck.com/opdavies/building-build-configs
+    id: e1403f0dfd8245e5a71df9761dc6bc7b
+    ratio: "1.78343949044586"
+    url: https://speakerdeck.com/opdavies/building-build-configs
 video: ~
 image: ~
 events:
-  -
-    name: PHP Oxford
-    location: Oxford, UK
-    date: 2024-01-25
-    url: https://www.meetup.com/php-oxford/events/297556113
-  -
-    name: PHP UserGroup Munich
-    date: 2024-01-23
-    url: https://www.meetup.com/phpugmunich/events/298411540
-    online: true
-  -
-    name: PHP South West (PHPSW)
-    location: Bristol, UK
-    date: 2023-11-08
-    url: https://www.meetup.com/php-sw/events/296917370
+    -
+        name: PHP Oxford
+        location: Oxford, UK
+        date: 2024-01-25
+        url: https://www.meetup.com/php-oxford/events/297556113
+    -
+        name: PHP UserGroup Munich
+        date: 2024-01-23
+        url: https://www.meetup.com/phpugmunich/events/298411540
+        online: true
+    -
+        name: PHP South West (PHPSW)
+        location: Bristol, UK
+        date: 2023-11-08
+        url: https://www.meetup.com/php-sw/events/296917370
 ---
 
 [Build Configs](/build-configs) is a tool I've created for creating and managing customised per-project configuration files, such as Docker, Docker Compose, Nix Flakes, and PHPUnit and PHPStan configuration.